Distorting a Square to Form a Hyperbolic Paraboloid

Consider the horizontal square cross section of a cube through its center. Distort the square by moving pairs of opposite vertices vertically along the edges of the cube until they coincide with the vertices of the cube. Each of the intermediate figures is a hyperbolic paraboloid. At either extreme position, the edges form four of the edges of a regular tetrahedron.
Restricting the plot range to lie over a circle with "border" creates a shape with rounded edges like certain potato chips.
Also, you can make a hole in the figure.

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Reference
[1] Wikipedia. "Pringles." (Apr 20, 2012) en.wikipedia.org/wiki/Pringles.
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